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I have a laptop running Ubuntu 13.04, however this has been an issue that has plagued me since I started using Ubuntu with 10.04. My laptop, after sitting idle for an extended amount of time, loses wireless internet connectivity. I am still connected to the network and I have a valid IP address, however when I try to browse the web or even ping a web address like www.google.com I cannot get a DNS resolution.

I have an Acer 7745G laptop and my wireless card is BCM43225 802.11b/g/n using Broadcom 802.11 Linux STA wireless driver source from bcmwl-kernel-source (proprietary)

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